1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  PS3 bootwrapper entry.
4 *
5 *  Copyright (C) 2007 Sony Computer Entertainment Inc.
6 *  Copyright 2007 Sony Corp.
7 */
8
9#include "ppc_asm.h"
10
11	.machine "ppc64"
12
13	.text
14
15/*
16 * __system_reset_overlay - The PS3 first stage entry.
17 *
18 * The bootwraper build script copies the 512 bytes at symbol
19 * __system_reset_overlay to offset 0x100 of the rom image.  This symbol
20 * must occupy 512 or less bytes.
21 *
22 * The PS3 has a single processor with two threads.
23 */
24
25	.globl __system_reset_overlay
26__system_reset_overlay:
27
28	/* Switch to 32-bit mode. */
29
30	mfmsr	r9
31	clrldi	r9,r9,1
32	mtmsrd	r9
33	nop
34
35	/* Get thread number in r3 and branch. */
36
37	mfspr	r3, 0x88
38	cntlzw.	r3, r3
39	beq	1f
40
41	/* Secondary goes to __secondary_hold in kernel. */
42
43	li	r4, 0x60
44	mtctr	r4
45	bctr
46
471:
48	/* Primary delays then goes to _zimage_start in wrapper. */
49
50	or	31, 31, 31 /* db16cyc */
51	or	31, 31, 31 /* db16cyc */
52
53	lis	r4, _zimage_start@ha
54	addi	r4, r4, _zimage_start@l
55	mtctr	r4
56	bctr
57
58	. = __system_reset_overlay + 512
59
60/*
61 * __system_reset_kernel - Place holder for the kernel reset vector.
62 *
63 * The bootwrapper build script copies 512 bytes from offset 0x100
64 * of the rom image to the symbol __system_reset_kernel.  At runtime
65 * the bootwrapper program copies the 512 bytes at __system_reset_kernel
66 * to ram address 0x100.  This symbol must occupy 512 bytes.
67 */
68
69	.globl __system_reset_kernel
70__system_reset_kernel:
71
72	. = __system_reset_kernel + 512
73